Dan Kegel's ISDN Page
Everything you need to know about ISDN.
http://www.alumni.caltech.edu/~dank/isdn/
ISDN Tutorial
Concepts, history, protocols, references, and more.
http://www.ralphb.net/ISDN/
ISDN*tek
Provides hardware for high speed access to the ISDN phone system
http://www.isdntek.com/
Stollmann ISDN E+V GmbH
Manufacturer of ISDN and X.25 products.
http://www.stollmann.de/
ISDN-Net Inc.
Offers links to the Internet as simple as a shell account and as complex as a personal point-to-point T1 connection utilizing new Connectionless Data Service technology.. all at reasonable prices.
http://www.isdn.net/
ISDN Zone
Reference for information on ISDN. A showcase of web technologies is included, too.
http://www.isdnzone.com
Cameron Communications Group
Provide digital communications sales, installation, engineering, and operations training to local exchange carriers, voice and data communications equipment manufacturers, federal, state and local government agencies, interconnect companies, and systems i
http://www.ccg4isdn.com/
ISDN Technologies
Offers predictive and auto dialers, ACD, and a range of call center services.
http://www.isdntechnologies.com/
National ISDN Council
Consortium of Local Exchange Carriers and telecom equipment manufacturers which has produced ISDN information and white papers.
http://www.nationalISDNcouncil.com/
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